John Francis Amherst Cecil (30 June 1890 – 22 October 1954) was the first secretary of the British Embassy, Washington, known for his marriage to Cornelia Stuyvesant Vanderbilt.

He was the third son of Lord William Cecil (1854–1943) and Mary Rothes Margaret Tyssen-Amherst, 2nd Baroness Amherst of Hackney (1857–1919).

[2] His father, a Groom-in-Waiting to Queen Victoria until her death in 1901 and an Extra Gentleman Usher from 1924 under King George V until 1937, was a younger son of the William Cecil, 3rd Marquess of Exeter and Lady Georgina Sophia Pakenham, the daughter of Thomas Pakenham, 2nd Earl of Longford.

Cornelia was the only child of the late George Washington Vanderbilt II and the former Edith Stuyvesant Dresser.

[12] After Paris, she moved to London, where she met and married Captain Vivian Francis Bulkeley-Johnson in October 1949.